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Impurities & Reference Standards

API Impurities

Source 1942 api impurities for research, QC and production, documented with COA and SDS.

14,098products

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COA + SDSwith every lot

Reference Standard

(S)-Ibrutinib (IBR) Diamine Impurity chemical structure

(S)-Ibrutinib (IBR) Diamine Impurity

CAS: 1288338-97-5
Formula: C₄₇H₄₆N₁₂O₃
MW: 826.9 g/mol

VQ-004281

Reference Standard

(S)-Ibuprofen Methyl Ester chemical structure

(S)-Ibuprofen Methyl Ester

CAS: 81576-55-8
Formula: C₁₄H₂₀O₂
MW: 220.31 g/mol

VQ-031136

Reference Standard

(S)-Isotimolol chemical structure

CAS: 158636-96-5
Formula: C₁₃H₂₄N₄O₃S
MW: 316.42 g/mol

VQ-028392

Reference Standard

(S)-Ketoprofen Ethyl Ester chemical structure

(S)-Ketoprofen Ethyl Ester

CAS: 136656-97-8
Formula: C₁₈H₁₈O₃
MW: 282.3 g/mol

VQ-037814

Reference Standard

(S)-Luliconazole-E-Isomer chemical structure

(S)-Luliconazole-E-Isomer

CAS: 256424-63-2
Formula: C₁₄H₉Cl₂N₃S₂
MW: 354.3 g/mol

VQ-031672

Reference Standard

(S)-Luliconazole-Z-Isomer chemical structure

(S)-Luliconazole-Z-Isomer

CAS: 2522922-36-5
Formula: C₁₄H₉Cl₂N₃S₂
MW: 354.3 g/mol

VQ-038184

Reference Standard

(S)-Mephenytoin chemical structure

(S)-Mephenytoin

CAS: 70989-04-7
Formula: C₁₂H₁₄N₂O₂
MW: 218.25 g/mol

VQ-033163

Reference Standard

(S)-Methyl 2-(2-oxopyrrolidin-1-yl)butanoate chemical structure

(S)-Methyl 2-(2-oxopyrrolidin-1-yl)butanoate

CAS: 358629-51-3
Formula: C₉H₁₅NO₃
MW: 185.22 g/mol

VQ-031509

Reference Standard

(S)-Methyl 5-methoxy-3,4-dihydro-2H-pyrrole-2-carboxylate chemical structure

(S)-Methyl 5-methoxy-3,4-dihydro-2H-pyrrole-2-carboxylate

CAS: 173142-47-7
Formula: C₇H₁₁NO₃
MW: 157.17 g/mol

VQ-028688

Reference Standard

(S)-N-((3-(4-Acetamidophenyl)-2-oxooxazolidin-5-yl)methyl)-5-chlorothiophene-2-carboxamide chemical structure

(S)-N-((3-(4-Acetamidophenyl)-2-oxooxazolidin-5-yl)methyl)-5-chlorothiophene-2-carboxamide

CAS: 2422046-61-3
Formula: C₁₇H₁₆ClN₃O₄S
MW: 393.8 g/mol

VQ-027857

Reference Standard

(S)-N-((R)-1-(Naphthalen-1-yl)ethyl)-2-(3-(trifluoromethyl)phenyl)propan-1-amine chemical structure

(S)-N-((R)-1-(Naphthalen-1-yl)ethyl)-2-(3-(trifluoromethyl)phenyl)propan-1-amine

CAS: 2059891-96-0
Formula: C₂₂H₂₂F₃N
MW: 357.4 g/mol

VQ-024979

Reference Standard

(S)-N-((S)-1-Amino-1-oxobutan-2-yl)-2-((R)-2-oxo-4-propylpyrrolidin-1-yl)butanamide chemical structure

(S)-N-((S)-1-Amino-1-oxobutan-2-yl)-2-((R)-2-oxo-4-propylpyrrolidin-1-yl)butanamide

CAS: 2432911-32-3
Formula: C₁₅H₂₇N₃O₃
MW: 297.39 g/mol

VQ-035392

Reference Standard

(S)-N-((S)-1-Amino-1-oxobutan-2-yl)-3-(chloromethyl)hexanamide chemical structure

(S)-N-((S)-1-Amino-1-oxobutan-2-yl)-3-(chloromethyl)hexanamide

CAS: 2052297-74-0
Formula: C₁₁H₂₁ClN₂O₂
MW: 248.75 g/mol

VQ-036029

Reference Standard

(S)-N-(1-(3-(2-Cyanobenzyl)-1-methyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)piperidin-3-yl)benzamide chemical structure

(S)-N-(1-(3-(2-Cyanobenzyl)-1-methyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)piperidin-3-yl)benzamide

CAS: 1618644-32-8
Formula: C₂₅H₂₅N₅O₃
MW: 443.5 g/mol

VQ-024207

Reference Standard

(S)-N-(1-(3-Methylbutanamido)-1-oxo-3-phenylpropan-2-yl)pyrazine-2-carboxamide chemical structure

(S)-N-(1-(3-Methylbutanamido)-1-oxo-3-phenylpropan-2-yl)pyrazine-2-carboxamide

CAS: 862894-96-0
Formula: C₁₉H₂₂N₄O₃
MW: 354.4 g/mol

VQ-021861

Reference Standard

(S)-N-(1-Amino-1-oxopropan-2-yl)-4-((3-fluorobenzyl)oxy)benzamide chemical structure

(S)-N-(1-Amino-1-oxopropan-2-yl)-4-((3-fluorobenzyl)oxy)benzamide

CAS: 2268802-59-9
Formula: C₁₇H₁₇FN₂O₃
MW: 316.33 g/mol

VQ-027971

Reference Standard

(S)-N-(2-(1-(3-Ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethyl)-1,3-dioxoisoindolin-5-yl)acetamide chemical structure

(S)-N-(2-(1-(3-Ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethyl)-1,3-dioxoisoindolin-5-yl)acetamide

CAS: 2201974-01-6
Formula: C₂₂H₂₄N₂O₇S
MW: 460.5 g/mol

VQ-029197

Reference Standard

(S)-N-(2-(1,6,7,8-Tetrahydro-2H-indeno[5,4-b]furan-8-yl)ethyl)acetamide chemical structure

(S)-N-(2-(1,6,7,8-Tetrahydro-2H-indeno[5,4-b]furan-8-yl)ethyl)acetamide

CAS: 326793-94-6
Formula: C₁₅H₁₉NO₂
MW: 245.32 g/mol

VQ-027734

Reference Standard

(S)-N-(2-(7,8-Dihydro-6H-indeno[5,4-b]furan-8-yl)ethyl)propionamide chemical structure

(S)-N-(2-(7,8-Dihydro-6H-indeno[5,4-b]furan-8-yl)ethyl)propionamide

CAS: 880152-62-5
Formula: C₁₆H₁₉NO₂
MW: 257.33 g/mol

VQ-027739

Reference Standard

(S)-N-(3-Chloro-4-fluorophenyl)-6-nitro-7-(tetrahydrofuran-3-yloxy)quinazolin-4-amine chemical structure

(S)-N-(3-Chloro-4-fluorophenyl)-6-nitro-7-(tetrahydrofuran-3-yloxy)quinazolin-4-amine

CAS: 314771-88-5
Formula: C₁₈H₁₄ClFN₄O₄
MW: 404.8 g/mol

VQ-020751

Reference Standard

(S)-N-(4-((3-Chloro-4-fluorophenyl)amino)-7-((tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)but-3-enamide

(S)-N-(4-((3-Chloro-4-fluorophenyl)amino)-7-((tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)but-3-enamide

CAS: 2413212-17-4
Formula: C₂₂H₂₀ClFN₄O₃
MW: 442.87 g/mol

VQ-020746

Reference Standard

(S)-N-(4-((3-Chloro-4-fluorophenyl)amino)-7-((tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)formamide chemical structure

(S)-N-(4-((3-Chloro-4-fluorophenyl)amino)-7-((tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)formamide

CAS: 2223677-60-7
Formula: C₁₉H₁₆ClFN₄O₃
MW: 402.8 g/mol

VQ-020752

Reference Standard

(S)-N-[[3-(3-Fluoro-4-(4-morpholinyl)phenyl)-2-oxo-5-oxazolidinyl]methyl]benzylamine hydrochloride chemical structure

(S)-N-[[3-(3-Fluoro-4-(4-morpholinyl)phenyl)-2-oxo-5-oxazolidinyl]methyl]benzylamine hydrochloride

CAS: 1236077-63-6
Formula: C₂₁H₂₅ClFN₃O₃
MW: 421.9 g/mol

VQ-038070

Reference Standard

(S)-N2,N2,6-Trimethyl-1,6-dihydro-1,3,5-triazine-2,4-diamine Hydrochloride (1:x)

(S)-N2,N2,6-Trimethyl-1,6-dihydro-1,3,5-triazine-2,4-diamine Hydrochloride (1:x)

CAS: 775351-62-7
Formula: C₆H₁₃N₅ ⁺ (HCl)x

VQ-037674

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